package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
public class UserServiceImpl implements UserService {

    private static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";
    @Autowired
    WeChatProperties wxProperties;
    @Autowired
    UserMapper userMapper;

    @Override
    public User login(UserLoginDTO userLoginDTO) {
        // 调用微信接口服务，获得当前微信用户的openid
        String openid = getOpenid(userLoginDTO);

        // 判断openid是否为空，如果为空表示登录失败，抛出异常
        if(openid == null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        // 判断当前用户是否为新用户
        User user = userMapper.getByopenid(openid);

        // 如果是新用户，则完成自动注册功能
        if(user == null){

            user = User.builder().openid(openid).createTime(LocalDateTime.now()).build();
            userMapper.register(user);
        }

        // 最后返回这个用户对象
        return user;
    }

    private String getOpenid(UserLoginDTO userLoginDTO) {
        Map<String, String> map = new HashMap<>();
        map.put("appid",wxProperties.getAppid());
        map.put("secret",wxProperties.getSecret());
        map.put("js_code", userLoginDTO.getCode());
        map.put("grant_type","authorization_code");
        String json = HttpClientUtil.doGet(WX_LOGIN, map);
        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        return openid;
    }
}
